How to use function getPlayerPermission?

Like the function name, it is created to check the permission that player has, To make it easier for you to understand, it is similar to setuperms of PurePerms

Example: 
$player->sendMessage("Your permission are: ".$this->rankProvider->getPlayerPermission($player));

OR

$player->sendMessage("ClickedTran's permission: ".$this->rankProvider->getPlayerPermission("ClickedTran"));

And that's it, quite simple :)